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Stimuli‐Responsive Biointerface Based on Polymer Brushes for Glucose Detection
Author(s) -
Crulhas Bruno P.,
Sempionatto Juliane R.,
Cabral Murilo F.,
Minko Sergiy,
Pedrosa Valber A.
Publication year - 2014
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201400030
Subject(s) - chronoamperometry , biosensor , glucose oxidase , detection limit , biointerface , polymer , materials science , dielectric spectroscopy , repeatability , chemistry , electrode , cyclic voltammetry , electrochemistry , chemical engineering , nanotechnology , chromatography , organic chemistry , engineering
The construction and characterization of a biosensor based on polymer brushes is reported. The use of polymer brushes combined with nanoparticles was applied to show its suitability as a biosensor platform – with glucose oxidase as an enzyme probe. The biosensor demonstrated a pH‐sensitive on‐off property, and it was further used to control or modulate the electrochemical responses. In terms of the kinetic behavior, we were able to show the changing in the kinetic parameters of glucose oxidase operating in “on” and “off” state of the polymer brushes. The performance of the bioelectrode was investigated by chronoamperometry, impedance electrochemistry and cyclic voltammetric techniques. At optimized experimental conditions the dynamic concentration range was 2.0 to 16.0 mmol L −1 with a detection limit of 5.6×10– 6 mol L −1 . The repeatability of current responses for injections of 5.0 mmol L −1 glucose was evaluated to be 5.3 % ( n =10). The resulting biosensor seemed to provide the enzymes with a biocompatible nanoenvironment as it sustained the enhanced enzyme activity for an extended time and promoted possible good electron transfer through the polymer brushes to the electrode.